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    Jumper J4 to convert from a T-cell 5 to a T-cell 15

    I get from reading the forums, that on an AquaTrol RJ board you can solder across J4 to convert from a T-cell 5 to a T-cell 15, but what exactly does the jumper do? What does J4 cause the board to do differently? (Is there other jumpers that do other neat things on the board? I wondered if there...